Citrate-Based MRI-Active Polymers for Deep Tissue Imaging
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Solution Overview
Problem
Current methods for predicting scaffold degradation in tissue engineering are inaccurate and lack real-time, non-invasive tracking of tissue regeneration and scaffold degradation in vivo, especially for deep tissue depths, necessitating the development of biodegradable imaging tools effective for deep tissue imaging.
Innovation Solution
The development of MRI-active or MRI-sensitive compositions comprising citrate-containing polymers or oligomers with integrated MRI contrast agents, which are also photoluminescent and biodegradable, allowing for both magnetic resonance imaging and photoluminescence imaging, enabling dual-imaging methods for tracking tissue regeneration and scaffold degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If in vitro degradation studies are used to predict scaffold degradation, then the process is simple and non-invasive, but the prediction accuracy is low and does not reflect actual in vivo degradation
Solution Approach 1:
The patent combines scaffold degradation monitoring with tissue regeneration imaging by incorporating dual-functional imaging agents (MRI and photoluminescence) directly into the scaffold material. This merging of diagnostic functions into the therapeutic scaffold itself enables accurate real-time tracking of both scaffold degradation and tissue formation in vivo, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The imaging scaffold serves multiple functions simultaneously: it provides structural support for tissue engineering, enables MRI imaging through gadolinium-containing polymers, and allows photoluminescence imaging through integrated fluorescent markers. This multi-functionality eliminates the need for separate monitoring systems, achieving high degradation prediction accuracy without proportionally increasing system complexity.
2Length of stationary object
If conventional imaging methods are used, then the imaging system is simple, but the imaging depth is limited and cannot effectively image deep tissues greater than 2 cm
Solution Approach 1:
The patent employs composite imaging materials that combine MRI contrast agents (gadolinium-containing polymers) with photoluminescent markers. This composite approach leverages the deep tissue penetration capability of MRI for reliable deep tissue imaging while incorporating photoluminescence for surface-level monitoring, thereby achieving effective imaging at depths greater than 2 cm with high reliability.
3Reliability
If biodegradable imaging tools are developed for deep tissue imaging, then the imaging effectiveness for deep tissues is improved, but the complexity of composing multi-functional polymers increases
Solution Approach 1:
The patent segments the imaging functionality into distinct modular components: gadolinium-containing polymers for MRI, photoluminescent polymers for optical imaging, and biodegradable polymer matrices for scaffold structure. These segmented functional modules can be independently optimized and then integrated, managing the complexity of creating multi-functional biodegradable imaging tools while maintaining deep tissue imaging effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These compositions provide effective, real-time imaging of tissue regeneration and scaffold degradation in deep tissues, enhancing the accuracy of tissue engineering processes by offering both MRI and photoluminescence imaging capabilities, facilitating better control over tissue formation and scaffold degradation.
Implementation Method 1
the one or more MRI-sensitive citrate-containing polymers or oligomers have an MRI-contrast agent integrated into or pendant from their polymeric or oligomeric backbone
Implementation Method 2
the compositions may be photoluminescent. For example, in addition to being MRI-sensitive, the compositions may be fluorescent in a wide range of wavelengths, such as in the near-infrared (NIR) region
Data Source
AI summary
In one aspect, compositions are described herein. In some embodiments, a composition described herein comprises, consists of, or consists essentially of an MRI-active or MRI-sensitive polymer or oligomer formed from (i) a non-alkoxylated and non-alkenoxylated citric acid, citrate, or ester/amide of citric acid, and optionally an alkoxylated or alkenoxylated citric acid, citrate, or ester/amide of citric acid, (ii) a polyol/polyamine such as a diol/diamine, (iii) a monomer comprising an MRI contrast agent, and (iv) an amino acid monomer. The polymer or oligomer may be photoluminescent and MRI-sensitive. In another aspect, imaging methods utilizing the compositions described herein are described. In another aspect, scaffolds, grafts, and films comprising, consisting of, or consisting essentially of the compositions described herein are described.